Fluorescence spectroscopy diagnostics on epithelium tissues requires being able to obtain depth resolved
measurements. We study here an optical probe combining a ball lens, a flat tip excitation fiber and a
bevel collection fiber. Varying the angle of the bevel collection fiber is seen to be a way of changing the
depth of the fluorescence collected signal. Fixing the excitation-collection distance, we observe that large
bevel angles of the collection fiber tip allows to augment the fluorescence collected signal of the stroma,
whereas small angles improve the signal from the epithelial layer.